Li Lina was a world famous doctor. She traveled the whole world solving the unsolvable cases. But even with such fame, and fortune, she was sad and lonely. Her only source of comfort was reading books. One day while reading the novel, "The Demon King's Wangfei", she die and get transported inside the book as the female lead's sickly elder sister. Now begins the romantic story of Li Lina, and the Demon King!